/*
 *  NachoCalendar
 *
 * Project Info:  http://nachocalendar.sf.net
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * Changes
 * -------
 *
 * 2004-12-11   Fixed setYear, now accepts years from 0 to 2100   
 * 2004-10-22   setEnabled(boolean b) overriden, now works
 * 2004-10-18   Changed the formatter for a MaskFormatter
 * 2004-10-01   Checked with checkstyle
 * 2004-9-3     Fixed borders
 *
 * -------
 * YearScroller.java
 *
 * Created on August 12, 2004, 6:47 PM
 */

package net.sf.nachocalendar.components;

import java.awt.GridBagConstraints;
import java.util.Calendar;

import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.border.Border;
import javax.swing.event.ChangeEvent;
import javax.swing.text.MaskFormatter;

/**
 * Component used to change the current year. It extends from JComboBox
 * and has two arrows for unitary changes. It fires a ChangeEvent
 * when the year is changed.
 * @author Ignacio Merani
 */
public class YearScroller extends javax.swing.JPanel {
    private JButton bNext;
    private JButton bPrevious;
    private JFormattedTextField tYear;
    
    /** Creates new form YearScroller. */
    public YearScroller() {
        initComponents();
        Calendar cal = Calendar.getInstance();
        tYear.setValue(new Integer(cal.get(Calendar.YEAR)));
        Border border = tYear.getBorder();
        tYear.setBorder(null);
        setBorder(border);
    }
    
    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    private void initComponents() {
        GridBagConstraints gridBagConstraints;

        bPrevious = new ArrowButton(ArrowButton.WEST);
        try {
            tYear = new javax.swing.JFormattedTextField(new MaskFormatter("####"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        bNext = new ArrowButton(ArrowButton.EAST);

        FormListener formListener = new FormListener();

        setLayout(new java.awt.GridBagLayout());

        bPrevious.addActionListener(formListener);

        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
        gridBagConstraints.weighty = 1.0;
        add(bPrevious, gridBagConstraints);

        tYear.setColumns(4);
        tYear.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        tYear.addActionListener(formListener);

        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
        gridBagConstraints.weightx = 1.0;
        gridBagConstraints.weighty = 1.0;
        add(tYear, gridBagConstraints);

        bNext.addActionListener(formListener);

        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
        gridBagConstraints.weighty = 1.0;
        add(bNext, gridBagConstraints);

    }

    private class FormListener implements java.awt.event.ActionListener {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            if (evt.getSource() == bPrevious) {
                YearScroller.this.bPreviousActionPerformed(evt);
            } else if (evt.getSource() == tYear) {
                YearScroller.this.tYearActionPerformed(evt);
            } else if (evt.getSource() == bNext) {
                YearScroller.this.bNextActionPerformed(evt);
            }
        }
    }
    
    private void tYearActionPerformed(java.awt.event.ActionEvent evt) {
            fireChangeListenerStateChanged(new ChangeEvent(this));
    }
        
    private void bNextActionPerformed(java.awt.event.ActionEvent evt) {
            setYear(getYear() + 1);
            fireChangeListenerStateChanged(new ChangeEvent(this));
    }
        
    private void bPreviousActionPerformed(java.awt.event.ActionEvent evt) {
            setYear(getYear() - 1);
            fireChangeListenerStateChanged(new ChangeEvent(this));
    }
        
        /**
         * Changes the icon for the Next button.
         * @param icon new Icon or null to show the default arrow
         */        
        public void setNextIcon(Icon icon) {
            bNext.setIcon(icon);
        }
        
        /**
         * Changes the icon for the Previous button.
         * @param icon new Icon or null to show the default arrow
         */        
        public void setPreviousIcon(Icon icon) {
            bPrevious.setIcon(icon);
        }
        
        /**
         * Changes the text of the Next button.
         * @param text new text or null to show the default arrow
         */        
        public void setNextText(String text) {
            bNext.setText(text);
        }
        
        /**
         * Changes the text of the Previous button.
         * @param text new text or null to show the default arrow
         */        
        public void setPreviousText(String text) {
            bPrevious.setText(text);
        }
        
        /**
         * Returns the current selected year.
         * @return current year
         */        
        public int getYear() {
            return ((Number) tYear.getValue()).intValue();
        }
        
        /**
         * Changes the current selected year.
         * @param year current year
         */        
        public void setYear(int year) {
            if ((year > 0) && (year < 2100)) {
                tYear.setValue(new Integer(year));
            }
        }
        
        /**
         * Registers ChangeListener to receive events.
         *
         * @param listener
         *            The listener to register.
         */
        public synchronized void addChangeListener(
        javax.swing.event.ChangeListener listener) {
            if (changeListenerList == null) {
                changeListenerList = new java.util.ArrayList();
            }
            changeListenerList.add(listener);
        }
        
        /**
         * Removes ChangeListener from the list of listeners.
         *
         * @param listener
         *            The listener to remove.
         */
        public synchronized void removeChangeListener(
        javax.swing.event.ChangeListener listener) {
            if (changeListenerList != null) {
                changeListenerList.remove(listener);
            }
        }
        
        /**
         * Notifies all registered listeners about the event.
         *
         * @param event
         *            The event to be fired
         */
        private void fireChangeListenerStateChanged(
        javax.swing.event.ChangeEvent event) {
            java.util.ArrayList list;
            synchronized (this) {
                if (changeListenerList == null) {
                    return;
                }
                list = (java.util.ArrayList) changeListenerList.clone();
            }
            for (int i = 0; i < list.size(); i++) {
                ((javax.swing.event.ChangeListener) list.get(i))
                .stateChanged(event);
            }
        }
        
    /**
     * Enables or disables the component
     * @param b true for enabling
     */
    public void setEnabled(boolean b) {
        bNext.setEnabled(b);
        bPrevious.setEnabled(b);
        tYear.setEnabled(b);
    }
    
    /**
     * Getter for enabled property
     * @return true if it's enabled
     */
    public boolean isEnabled() {
        return tYear.isEnabled();
    }
    
    /**
     * Utility field holding list of ChangeListeners.
     */
    private transient java.util.ArrayList changeListenerList;
    
}
